Adapter for USB and audio interface

Abstract

An adapter includes a first USB interface, a second USB interface, and an audio interface. The first and the second USB interfaces each have a power pin, a first data pin, a second data pin, and a ground pin. The pins of the first USB interface respectively connected to the pins of the second USB interface correspondingly. The audio interface includes a left ear audio pin, a right ear audio pin, and a ground pin. The left ear audio pin of the audio interface is connected to the first data pin of the second USB interface. The right ear audio pin of the audio interface is connected to the second data pin of the second USB interface.

1. An adapter comprising:
 a first universal serial bus (USB) interface having a power pin, a first data pin, a second data pin, and a ground pin; 
 a second USB interface having a power pin, a first data pin, a second data pin, and a ground pin, the pins of the first USB interface respectively connected to the pins of the second USB interface correspondingly, wherein the types of the first and second USB interfaces are different; and 
 an audio interface having a left ear audio pin, a right ear audio pin, and a ground pin, the left ear audio pin of the audio interface connected to the first data pin of the second USB interface, the right ear audio pin of the audio interface connected to the second data pin of the second USB interface; 
 wherein the first and second USB interfaces are capable of connecting between two corresponding electronic devices respectively for communicating the two electronic devices; the second USB interface and the audio interface are capable of connecting between two corresponding audio devices respectively for transmitting audio signals between the two audio devices, wherein a first variable resistor is connected between the left ear audio pin of the audio interface and the first data pin of the second USB interface, a second variable resistor is connected between the right ear audio pin of the audio interface and the second data pin of the second USB interface. 
 
   
   
     2. The adapter as claimed in  claim 1 , wherein the first variable resistor and the second variable resistor are installed in a main body having a first knob and a second knob mounted thereon, the first knob is connected to an adjusting terminal of the first variable resistor to adjust the resistance thereof, the second knob is connected to an adjusting terminal of the second variable resistor to adjust the resistance thereof. 
   
   
     3. The adapter as claimed in  claim 2 , wherein the first USB interface is connected to the main body via a data cable, the audio interface and the second USB interface are respectively mounted on opposite ends of the main body, the first knob and the second knob are respectively mounted on opposite sides of the main body. 
   
   
     4. The adapter as claimed in  claim 1 , wherein the first USB interface is a standard USB interface, the second USB interface is a mini-USB interface, and the audio interface is a 3.5 mm audio interface. 
   
   
     5. An adapter comprising:
 a first universal serial bus (USB) interface having a power pin, a first data pin, a second data pin, and a ground pin; 
 a second USB interface having a power pin, a first data pin, a second data pin, and a ground pin, the pins of the first USB interface respectively connected to the pins of the second USB interface correspondingly; and 
 an audio interface having a left ear audio pin, a right ear audio pin, and a ground pin, the left ear audio pin of the audio interface connected to the first data pin of the second USB interface, the right ear audio pin of the audio interface connected to the second data pin of the second USB interface; 
 wherein a first variable resistor is connected between the left ear audio pin of the audio interface and the first data pin of the second USB interface, a second variable resistor is connected between the right ear audio pin of the audio interface and the second data pin of the second USB interface; the first variable resistor and the second variable resistor are installed in a main body having a first knob and a second knob mounted thereon, the first knob is connected to an adjusting terminal of the first variable resistor to adjust the resistance thereof, the second knob is connected to an adjusting terminal of the second variable resistor to adjust the resistance thereof.